<style>
    img {
      width: 100%;
    }
    </style>
    
    <img src="./imgs/loading.gif" data-src="./imgs/01.jpg" alt="">
    <img src="./imgs/loading.gif" data-src="./imgs/02.jpg" alt="">
    <img src="./imgs/loading.gif" data-src="./imgs/03.jpg" alt="">
    <img src="./imgs/loading.gif" data-src="./imgs/04.jpg" alt=""> 
    <script src="./iq.js"></script>
    <script src="./jq-lazyload.js"></script>
    <script>
    $('img').lazyLoad()
    </script>